In a paper appearing in Physical Review B, however, Xiao-Liang Qi, Tayor Hughes, and Shou-Cheng Zhang of Stanford University [2] show that a term ΔL_axion, analogous to what was predicted in high-energy physics, is present in the theoretical description of a class of crystalline solids called topological insulators.

Here's another example where condensed matter system actually can be a testbed for many fundamental concepts that may not be as difficult to test when compared to what is required in high energy physics experiments.